Characterization of potassium glycinate for carbon dioxide absorption purposes

A. F. Portugal, P. W. J. Derks, G. F. Versteeg, F. D. Magalhaes, A. Mendes

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Abstract

Aqueous solutions of potassium glycinate were characterized for carbon dioxide absorption purposes. Density and viscosity of these solutions, with concentrations ranging from 0.1 to 3 M, were determined at temperatures from 293 to 313 K. Diffusivity of CO2 in solution was estimated applying the modified Stokes-Einstein relation. Solubilities of N2 O at the same temperatures and concentrations were measured and the ion specific parameter based on Schumpe's model was determined for the glycinate anion; the solubilities of CO2 in these solutions were then computed. The reaction kinetics of CO2 in the aqueous solution of potassium glycinate was determined at 293, 298 and 303 K using a stirred cell reactor. The results were interpreted using the DeCoursey equation for the calculation of the enhancement factor. The rate of absorption as a function of the temperature and solution concentration for the conditions studied was found to be given by the following expression:- rCO2 = 2.42 × 1016 exp fenced(frac(- 8544, T)) exp (0.44 CS) CS CCO2 .
Original languageEnglish
Pages (from-to)6534-6547
Number of pages14
JournalChemical Engineering Science
Volume62
Issue number23
DOIs
Publication statusPublished - 2007

Keywords

  • Viscosity
  • Solubility
  • Potassium compounds
  • Negative ions
  • Mass transfer
  • Concentration (process)
  • Carbon dioxide
  • Amino acids
  • Absorption
  • Stokes-Einstein relation
  • Potassium glycinate
  • Enhancement factor
  • N2 O solubility
  • Kinetics
  • Glycine

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